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a-12=-28-a
We simplify the equation to the form, which is simple to understand
a-12=-28-a
We move all terms containing a to the left and all other terms to the right.
+1a+1a=-28+12
We simplify left and right side of the equation.
+2a=-16
We divide both sides of the equation by 2 to get a.
a=-8
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